Sound-box



H Y. PflmnERaAs sauna-Box.

APPLICATION FILED MAR. 6, 19H]- 1 33 ,39 Patented Apr. 27,19 .20; v

/ INVEQIOR ATTORNEY i on line 'io.

EARQLIB PRENDERGAfiT, 0E3" BROGKLYN,

Specification of Letters Patent.

E-e/tcitLted A1112. 2?, 19,20.

, Apnlication siee March 'e, 1913. n0. ceases.

f ail whom 2'1; may concern Be it known thet 1i, HARoLD Y. PRENDER- exist, it subject of the King of Greet Brits-in, residing at Brooklyn, in the county of Kings end State of New York, have invented. new and useful Improvements in Eouml- Boxes, of which the following is a specifics tion. 1

iiLIy invention relates to sound "boxes for :ceproducing sounds; end its objects are to restrict range of "vibration for the phlegm Without imgeiring its clarity of tone to feciiitate the transference of sound. to the tone arm, toimpro've the queiity of sound reproduction, to provide a better and. more effective mounting of to simplify the construc n of scent}. box and the. securing together of the st ere pests end in general to reorganize emi render more effective the operation of the several parts.

ing; a. conneo o. for the styins heir compile ing two hiecies arranged in tandem, e

er-ztcnciing in. a, direction. peieiiei to the chm iiiiilfii'l and viiufztting in unison. the n "located th .o well. f the aunt i y to secure the ends of sists in verions other fiifikilii one and improvements hereinafter incite specifically i'iesci'ihed and. Giailllfiii;

Attention hereby directed. to the accompenying throwing in which sin or nutrieneis of designation refer to simiiei' ports throughout the several views. fl "'fiQW of my improved sound stylus Figure 1 is e hex from the side eidiacent to the her;

2 e sect-ion of i.

the arrows;

F is :1 View a to the s end earn.

the her; from the sic e the stylus her.

it very ch arm:

" materiel, and. ispi'efembly in the form of a short hoiiow cyiindei",

Within the said box, near one end. thereof, is the annular seat 8, against which rests the washer 9, in contact with the periphery ofthe diaphragm 10. On the opposite side of the diaphragm is the sounding board 11,

separated thei'e fxl'om by the Washer 12. The sounding board 11 is preferably slightly dished in iori'n the central portion thereof being et'the greatest distance from the ed-' jzicent diaphragm, and is preferably constructed of Wood, of the character usually empioyed. for musical instruments, b 1t may he made of metal 01 any other suitable niw tei-iai. Fromexperience I find about the best results W'iii he obtained from silwigi'sinczi spruce, ptoperiy seasoned. eiid yeif i in the manner that the some is omii eyed for use in. the construction inst of "m anti nienos 0! other Wooden musicei ieitst in the center of said S( Ufi(iih: me i is the orifice 13 through which passes sonini. coming from or goingyto the diopni'egin 10, as the case may he; Between the diaphragm and the soumh .ing board is accordingly formed the sound chamber lei, which prefei'ehiy gredueiiy tp toweifci'thc WEtii of the box. Through of: this peciiiier form of conheve foind that the tone of in niinen s 331 .21 inipi'oveei, particueriy as to if'yq d tinctness and. eccen tnetion "1 dished or tapering; constitueticu oi the sounding hosed. serving to if, the iesonence oi the sound end at t, ow its tone, eiehy givin 'ic effect c i As well known, in the reprociuction of certain tones there is grave danger that the diaphragm of ordinary construction beset in such "vio n vibration that such tones he come shriii. in i-esping', the vibration he ing abnormally increased for beyondthose necessary for the correct reproduction. of To guard against such hiy provide my sounding *ijw'steii cyiinchicei' spring rests against the Washer: ct with the sounding board 11 and the other emit one it. iii in cont ed' acent to the orifice 13.,

of which rests against the Washer 17 in,

Hit?

tact with the detachable cover 18,:theiehy cieutiy to take up part of such vibrations,

andadjustments can be so made as to confine the vibrations of the diaphragm within a predetermined range of vibration. Thus, is when notes of a hi h register are being reproduced, the tendency toward 'shrillness by reason. of too rapid vibration of the diaphragm is controlled at a point within the capacity of the machine for clear tonal reproduction, without setting up the increased vibration, reproducing false tonal effects.

In other words, by establishing by mechanical means-a certain boundary of vibration, I am enabled to' eliminate up to a certain.

: point, the tendency of the vibrations of any diaphragm to extend beyond the number of vibrations necessary to properly reproduce the sound. 1 I

Although I have found the tubular form of spring; 15, above described, very satisfactory and accomplishing the best results, I,

have also found that good results may be obtained. from helical or other springs, the

convolutions of which are arrangedto sur- '30 round the passageway 13.

While, as used in my invention, the diaphragm 10 may be of mica or other suitable material, 'I preferto use other material as, for example, an opaque diaphragm. of mate- ?i-a rial other than mica, which may be colored with some distinctive color, and which is susceptible of being printed with the nameof the maker, a trade mark, or embellished I in some characteristic manner, a feature not 40'..possessed by micaby reason of its brittle 'ness and non-absorptive qualities.

At the center of the cover 18, and pref erably integral. therewith, the Wall 19 of the passageway '13 leading; to the tone-arm.

' At the edge of the cover 1.8 is the ring 20 through which. pass the screws 21, the ends of which pass through adj acent openings in the wall of the'box and engage with screw threaded openings 22in the ring 23.

By using conjoint means for attaching both the covers of the box at the same time, I am enabled quickly to assemble the parts, and as quicklyto take the same apart with out waste of time, thereby rendering the interior of the box readily aci'sessillle. If desired, the number of screws 21' employed could be increased ordiminished without rendering the construction 'ineifective, and other obvious changes might be made.

While I have described my invention with particular reference to its embodiment in. the preferred form of construction above set forth, do not desire to be understood as confining the. scope of my; invention to the details of construction herein set forth,

and

since, as obvious, various modifications ..;iang-s might be eiiected without departing froni the s it thereof.

hat I claim and desire to securd'by Let ters Patent is,---

'1. In a sound box, the combination of a diaphragm a tube forming a passageway i'or conveying sound therefrom, and a wooden sounding board located in spaced relation to the diaphragm and on the same side thereof as the passage-way, the center of said sounding board being farthest away from id diaphragm, said sounding board intermittently vibrating during the vibrating of the diaphragm. p 2.'In. a sound box,the'combination of a diaphragm, a tube forming a passage-why for conveying sounds therefrom, and a wooden sounding board located in spaced relation to said diaphragm and on the same side thereof as said passage-Way, the center of said sounding board being farthest away from said diaphragijm, said sounding board ruitomatically vibrating; during the vibratinn; of the diaphragm.

3. in. a sound box, the combination ofa diaphragm, a sounding board. held in spaced relation to the diaphragm, and a cylindrical spring, said sounding board being held by said spring to yield to excessive vibrations of the diaphragm.

1 4. In a sound box, the combination of a diaphragm, a sounding board, and a spring for holding the sounding board in e36 tive' relation to the diaphragm, said s7, being so tensioned that the sounding bowill normally vibrate in. unison with the 1 excessive phragm but will yield to "tampon vibrations of the diapl. n.

5. A sound box embodying a seat, a diephragm associated with said seat, a frustoconoidal sounding board spaced. from the diaphragm, and a spring for holding the diaphragm to its seat and the sounding board in spaced. relation to the diaphragm,

o. A sound box embodying 'a seat, a diaphragm associated therewith, a tube forming a passage-way adapted/to deliver the vibratory waves from the diaphragm to a tone arm, and a frusto-conoidal sounding board spaced from the diaphragm on the passage-way side thereof and having formed therein an aperture registering with the mouth of the passage-way, in combination with a spring for maintaining the diaphragm to its seat and the sounding board in spaced relation thereto.

7 A sound box embodying a seat,ia diaphragm associated therewith, a tube forming a passage-way adapted. to deliver the vibratory waves from the diaphragm to a tone arm, and a frusto-conoidal sounding board spaced from the diaphragm 'on the passage-way side thereof and having formed therein an aperture registering with the spaced relation thereto.

'month of the passage-way, in combination with a spring positioned coa'xially of the pas$age-Way and' impeliing' the .sounding board toward the diaphragm for the purpoe' e of holding the diaphragm to its seat maintaining the sounding board in 8. A sound box embodying a diaphragm, a'vtubeforming a passage-iwayffor conveying sounds' therefrom, and afrusto-eonoidal 10 sounding board located. in spaced. relation to the diaphragm on the passage-Wayside thereof, and adapted-to be vibrated by the Vibratory waves'set up by the diaphragm.

. In testimony whereof I have hereunto set 1151 

